Coast Line Stage Co., San Francisco, Cal., printed corner card with handsome illustration of horses and stagecoach, used with 3c Green (184), perf defects, tied by San Francisco Cal. datestamp and cork cancel, on Nov. 1878 cover with enclosure with matching letterhead, fresh and very fine, very scarce, this company is supposed to have carried the U.S. mail and Wells, Fargo express from San Francisco to points south between 1868 and the late 1870s, so it is possible this letter was picked up along the way